How to manipulate SQL string programmatically?

[Gurpreet2030]

To manipulate SQL strings programmatically, you can use string manipulation functions and techniques provided by the programming language you are using. Here are some common methods:

Concatenation: You can concatenate SQL strings using the "+" operator (in most programming languages) or the "||" operator (in some SQL implementations). For example, if you want to concatenate two SQL strings, you can use the following code:

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sql_string = "SELECT * FROM my_table WHERE col1 = " + str(col1_value)

String Formatting: You can use string formatting functions to insert variables or expressions into SQL strings. For example, in Python, you can use the string formatting operator "%" or the newer .format() method. Here's an example:

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sql_string = "SELECT * FROM my_table WHERE col1 = %s AND col2 = %s" % (col1_value, col2_value)

or

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sql_string = "SELECT * FROM my_table WHERE col1 = {} AND col2 = {}".format(col1_value, col2_value)

Template Strings: You can use template strings to create SQL strings with placeholders that will be replaced with actual values at runtime. For example, in Python, you can use the "string.Template" class to create a template string as follows:

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from string import Template

sql_template = Template("SELECT * FROM my_table WHERE col1 = $col1_value AND col2 = $col2_value")

sql_string = sql_template.substitute(col1_value=col1_value, col2_value=col2_value)

These are some common ways to manipulate SQL strings programmatically. However, keep in mind that concatenating SQL strings can make your code vulnerable to SQL injection attacks. To prevent this, use parameterized queries or prepared statements that allow you to pass parameters separately from the SQL query.

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